Geotechnical Properties of Fibrous and Amorphous Peats for the Construction of Road Embankments
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 7
Abstract
Peat deposits cover large areas in Northern Canada. Peat in the study area in Northern Manitoba has an average thickness of 4 m, with the upper half classified as fibrous and the lower half as amorphous with strong to complete decomposition. Design, construction, and maintenance procedures for new road embankments on seasonally frozen peat deposits require mechanical, hydraulic, and thermal properties of the foundation. Laboratory tests were conducted on samples obtained from a test section along a newly constructed road. Hydraulic conductivity tests were conducted at different vertical stresses to determine permeability. Thermal conductivities were determined at frozen and unfrozen states. Conventional incremental-loading (IL) odometer tests were performed to determine the compressibility and secondary compression indices of the peat layers. Constant-rate-of-strain (CRS) tests were also done to supplement the results obtained from the conventional method. Isotropically consolidated undrained (CIU) triaxial tests were carried out, and a new method of evaluating the shear strength of peat was implemented. Numerical modeling that used the measured mechanical, hydraulic, and thermal properties simulated reasonably well the performance of road embankments constructed on seasonally frozen peat. With these properties, construction and long-term performance of highway embankments and future infrastructure development on peat foundations can be reasonably predicted, leading to effective construction and maintenance procedures.
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Acknowledgments
This work was supported by Manitoba Infrastructure and Transportation (MIT), AECOM Ltd., and the Natural Sciences and Engineering Research Council (NSERC) of Canada. The assistance of Kerry Lynch and Hee-Yong Chen in installing the instrumentation is greatly appreciated. Cory-Jay Pyziak helped in carrying out the laboratory experiments. MIT engineers and technologists provided logistical support at the construction site.
References
Andersland, O. B., and D. Anderson. 1978. Geotechnical engineering for cold regions. New York: McGraw-Hill.
Andersland, O. B., and B. Ladanyi. 2004. Frozen ground engineering. Hoboken, NJ: Wiley.
ASTM. 2008. Standard test method for determination of thermal conductivity of soil and soft rock by thermal needle probe procedure. ASTM D5334. West Conshohocken, PA: ASTM.
ASTM. 2010. Standard test methods for measurement of hydraulic conductivity of saturated porous materials using a flexible wall permeameter. ASTM D5084. West Conshohocken, PA: ASTM.
ASTM. 2011a. Standard test method for consolidated undrained triaxial compression test for cohesive soils. ASTM D4767. West Conshohocken, PA: ASTM.
ASTM. 2011b. Standard test methods for one-dimensional consolidation properties of soils using incremental loading. ASTM D2435. West Conshohocken, PA: ASTM.
ASTM. 2012. Standard test method for one-dimensional consolidation properties of saturated cohesive soils using controlled-strain loading. ASTM D4186. West Conshohocken, PA: ASTM.
Axelsson, K., S. E. Johansson, and R. Andersson. 2002. Stabilization of organic soils by cement and Puzzolanic reactions—Feasibility study. Linköping, Sweden: Swedish Geotechnical Institute.
Barden, L., and P. L. Berry. 1968. “Model of the consolidation process in peat soils.” In Proc., 3rd Int. Peat Congress, 119–127. Quebec.
Brown, R. J. E. 1968. “Occurrence of permafrost in Canadian Peatlands.” In Proc., 3rd Int. Peat Congress, 174–181. Quebec.
De Guzman, E. M. B. 2015. “Road embankments on seasonally-frozen peat foundations.” M.Sc. thesis. Dept. of Civil Engineering, Univ. of Manitoba.
De Guzman, E. M. B., and M. C. Alfaro. 2016. “Performance of road embankments on seasonally-frozen peat foundations with and without corduroy bases.” J. Perform. Constr. Facil. 30 (6): 1–9. https://doi.org/10.1061/(ASCE)CF.1943-5509.0000906.
Den Haan, E. J., and G. A. M. Kruse. 2007. “Characterization and engineering properties of Dutch peats.” In Proc., 2nd Int. Workshop on Characterization and Engineering of Natural Soils, 2101–2133. London, UK: Taylor & Francis.
Edil, T. B. 2003. “Recent advances in geotechnical characterization and construction over peats and organic soils.” In Proc., 2nd Int. Conf. in Soft Soil Engineering and Technology, 1–16. Seri Kembangan, Malaysia: Universiti Putra Malaysia.
Farouki, O. T. 1981. Thermal properties of soils CRREL monograph 81–1. Hanover, NH: US Army Corps of Engineers.
Farrell, E. R., and S. Hebib. 1998. “The determination of the geotechnical parameters of organic soils.” In Proc., Int. Symp. on Problematic Soils, 33–36. Rotterdam, Netherlands: A.A. Balkema.
Goodrich, L. E. 1986. “Field measurements of soil thermal conductivity.” Can. Geotech. J. 23 (1): 51–59. https://doi.org/10.1139/t86-006.
Harlan, R. L., and J. F. Nixon. 1978. “Ground thermal regime.” In Geotechnical engineering for cold regions, edited by O. B. Andersland and D. M. Anderson, 103–163. New York: McGraw-Hill.
Hebib, S., and E. R. Farrell. 2003. “Some experiences on the stabilization of Irish peats.” Can. Geotech. J. 40 (1): 107–120. https://doi.org/10.1139/t02-091.
Hendry, M. T., J. S. Sharma, C. D. Martin, and S. L. Barbour. 2012. “Effect of fibre content and structure on anisotropic elastic stiffness and shear strength of peat.” Can. Geotech. J. 49 (4): 403–415. https://doi.org/10.1139/t2012-003.
Hobbs, N. B. 1986. “Mire morphology and the properties and behaviour of some British and foreign peats.” Q. J. Eng. Geol. Hydrogeol. 19 (1): 7–80. https://doi.org/10.1144/GSL.QJEG.1986.019.01.02.
Hollingshead, G. W., and G. P. Raymond. 1972. “Field loading tests on Muskeg.” Can. Geotech. J. 9 (3): 278–289. https://doi.org/10.1139/t72-031.
Johansen, O. 1975. “Thermal conductivity of soils.” Ph.D. thesis, Trondheim, Norway: Institute for Cold Technology, Norwegian Technical Univ.
Konovalov, A. A., and L. T. Roman. 1973. “The thermophysical properties of peat soils.” Soil Mech. Found. Eng. 10 (3): 179–181. https://doi.org/10.1007/BF01706681.
Kurz, D., M. Alfaro, and J. Graham. 2017. “Thermal conductivities of frozen and unfrozen soils at three project sites in northern Manitoba.” Cold Reg. Sci. Technol. 140: 30–38. https://doi.org/10.1016/j.coldregions.2017.04.007.
Landva, A. O. 2007. “Characterization of Escuminac peat and construction on Peatland.” In Proc., 2nd Int. Workshop on Characterization and Engineering of Natural Soils, 2135–2191. London, UK: Taylor & Francis.
Landva, A. O., J. I. Clark, J. H. A. Crooks, and W. J. Burwash. 1986. “Degradation of peats and organic soils under engineered structures—A preliminary study.” In Proc., Advances in Peatlands Engineering, 109–115. Ottawa.
Landva, A. O., and P. La Rochelle. 1983. “Compressibility and shear characteristics of Radforth peats.” In Testing of peats and organic soils, edited by P. M. Jarrett, 157–191. West Conshohocken, PA: ASTM.
Lefebvre, G., P. Langlois, C. Lupien, and J.-G. Lavallée. 1984. “Laboratory testing and in situ behaviour of peat as embankment foundation.” Can. Geotech. J. 21 (2): 322–337. https://doi.org/10.1139/t84-033.
Long, M. 2005. “Review of peat strength, peat characterisation and constitutive modelling of peat with reference to landslides.” Studia Geotechnica et Mechanica. 27 (3–4): 67–90.
MacFarlane, I. C. 1956. “Techniques of road construction over organic terrain.” In Proc., Eastern Muskeg Research Meeting, 2–15. Ottawa: National Research Council of Canada.
MacFarlane, I. C. 1968. “Strength and deformation tests on frozen peat.” In Proc., 3rd Int. Peat Congress, 143–149. Quebec.
Mesri, G., and M. Ajlouni. 2007. “Engineering properties of fibrous peats.” J. Geotech. Geoenviron. Eng. 133 (7): 850–866. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:7(850).
Mesri, G., T. D. Stark, M. Ajlouni, and C. S. Chen. 1997. “Secondary compression of peat with or without surcharging.” J. Geotech. Geoenviron. Eng. 123 (5): 411–421. https://doi.org/10.1061/(ASCE)1090-0241(1997)123:5(411).
Mills, G. F. 1983. “Peatland inventories in Manitoba.” In Proc., Peatland Inventory Methodology Workshop, 35–50. Ottawa.
Rowe, R. K., and B. L. J. Mylleville. 1996. “A geogrid reinforced embankment on peat over organic silt: A case history.” Can. Geotech. J. 33 (1): 106–122. https://doi.org/10.1139/t96-027.
Satibi, S. 2009. “Numerical analysis and design criteria of embankments on floating piles.” Ph.D. dissertation, Dept. of Civil and Environmental Engineering, Institute of Geotechnical Engineering, Universität Stuttgart.
Schwärzel, K., M. Renger, R. Sauerbrey, and G. Wessolek. 2002. “Soil physical characteristics of peat soils.” J. Plant Nutr. Soil Sci. 165 (4): 479–486. https://doi.org/10.1002/1522-2624(200208)165:4%3C479::AID-JPLN479%3E3.0.CO;2-8.
Tarnocai, C. 1984. Peat resources in Canada. Ottawa: National Research Council of Canada.
Tarnocai, C., I. M. Kettles, and B. Lacelle. 2011. Peatlands of Canada Map 6561. Ottawa: Geological Survey of Canada.
Varosio, G. 2000. “Peat subsidence due to ground water movements.” In Geotechnics of high water content materials, edited by T. B. Edil and P. J. Fox, 375–386. West Conshohocken, PA: ASTM.
Yamaguchi, H. 1990. “Physiochemical and mechanical properties of peats and peaty ground.” In Proc., 6th Int. Congress of the Int. Association of Engineering Geology, 521–526. Rotterdam, Netherlands: A.A. Balkema.
Yamaguchi, H., Y. Ohira, K. Kogure, and S. Mori. 1985. “Undrained shear characteristics of normally consolidated peat under triaxial compression and extension conditions.” Soils Found. 25 (3): 1–18. https://doi.org/10.3208/sandf1972.25.3_1.
Zhang, L., and B. C. O’Kelly. 2014. “The principle of effective stress and triaxial compression testing of peat.” Proc. Inst. Civ. Eng. Geotech. Eng. 167 (1): 40–50. https://doi.org/10.1680/geng.12.00038.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 7 • July 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: May 15, 2017
Accepted: Jan 9, 2018
Published online: May 14, 2018
Published in print: Jul 1, 2018
Discussion open until: Oct 14, 2018
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